What is an ideal machine ?
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A machine in which no part of the work done on the machine is wasted i.e., the efficiency of the machine is 1 or 100 per cent, is called an ideal or perfect machine.
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Explain the term mechanical advantage of a machine.
Define the term efficiency of a machine.
Can a machine have an efficiency of 100% ? Give a reason to support your answer.
'A machine is 75% efficient'. What do you understand by this statement?